Definition of "photometric" [pho•to•met•ric]

• Of or relating to photometry or to photometers. (adjective)
• Adjusting position with respect to light. (adjective)

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• "Long-term photometric measurements of Neptune show variations of brightness over half a century."
• "IP66 tightness level that guarantees that they will stay clean inside and deliver long-term photometric performance."
• "The group would be called the photometric task force, and would consist of Hogg, David Schlegel, and Doug Finkbeiner."